SANFORD, Fla. — The prosecution in the murder trial of George Zimmerman wrapped up its case Friday after a dramatic day of testimony with Travyon Martin’s mother and brother saying the screams for help that can be heard in the background on a 911 call came from the 17-year-old.

Before the defense began its case, defense attorney Mark O’Mara argued Zimmerman should be acquitted, saying prosecutors hadn’t proved their case.

“What is before the court is an enormous amount of information my client acted in self-defense,” O’Mara told Judge Debra Nelson.